Glenn is a likable and resourceful guy who is always willing to help. After failing to reconnect with his estranged family, Glenn is on the road back to Atlanta where he hopes to find his brother, and where fate will lead him to meet up with Kentucky Sheriff's Deputy Rick Grimes.

Glenn's first move involves attaching a padlock to the gate of the drugstore, locking out the Walker horde that is chasing the group.

He is then seen briefly in the drug store owned by Lee's parents, but volunteers almost immediately to go on a supply trip. Clementine gives Glenn one of her two walkie-talkies so he can alert them to any problems.

Glenn is then out of the group for a while until he uses Clementine's walkie-talkie to contact Lee, prompting Lee and Carly to travel to the Motor Inn Motel to rescue Glenn, who has been pinned down by Walkers.

Upon arrival the two find Glenn hiding out in a icebox. He reveals that he was about to return to the group but can hear a survivor in the nearby motel.

Lee and Carly then agree to help get to the survivor, prompting a scene where they take down a selection of Walkers currently occupying the parking lot and other areas of the motel.

It is at this point you can start to suspect that Glenn has a history of car theft, as he knows how to break a window of a truck by using a spark plug. This ties in with the comic, where he later reveals he has stolen cars in the past.

Once all of the Walkers are taken care of, Glenn, Lee and Carly encounter Irene, who reveals she has been bitten.

Glenn's reaction to the decision of whether to let Irene commit suicide differs depending on your actions, but it ultimately doesn't matter much as Glenn only appears in this episode.

Upon deciding what to do with Irene, Glenn will then return with Lee and Carly to the drug store.

He brings gas with him for Kenny's truck. Talking to him at this point reveals he doesn't want to talk about his family, and that he seems quite content to stay with the group.

He also reveals he delivers pizzas, and that he delivered to Lee's parents at the drug store a few times.

As the episode winds down, Glenn finally decides that he wants to leave the group, in search of his friends in Atlanta. This leads directly into his appearance in the comic, where he is encountered by Rick Grimes in the zombie-overrun Atlanta.

The decision that prompts him to leave is listening to a news report saying that Atlanta has been designated as a stage 9 catastrophe. Lee can comment on Glenn's decision, but it doesn't have any effect on his decision.

He accidentally takes Clem's walkie talkie with him, leaving her with just one.Spoiler - Click to see/hide